|
|
|
题名
|
作者
|
年代
|
出处
|
被引量
|
| 1 | Influence of particle shape on the erodibility of non-cohesive soil: Insights from coupled CFD-DEM simulations显示文摘 | Yuan Guo Yang Yang Xiong (Bill) Yu | 2018 | Particuology2018，16，4： | 6 |
| 2 | Design and analyses of open-ended pipe piles in cohesionless soils显示文摘大无限制的管子堆积被发现了为在交通工程的使用有益。然而,当前的设计方法足够地没被开发。为了关上这个惯例,豁开,这份报纸首先在沙的土壤为无限制的管子堆积总结了不同设计方法。为所有设计代码的一个主要因素是适当地说明土壤塞子的形成和效果。比较显示由于土壤塞子的复杂行为在在不同方法之中的基础能力评估有一个大变化。为了关上知识,豁开,分离元素方法(DEM ) 被用来模仿插过程的土壤并且在插的机制上提供卓见。模拟结果证明拱的效果显著地增加内部单位砍沿着管子堆积的电阻。从 DEM 模型的孔分发和粒子接触力量分发显示大压力集中发生在土壤塞子的底部。而且,将近 90% 塞子电阻被底部提供土壤列的半部分。土壤堆积磨擦系数在塞子抵抗的大小上有重要效果,与主要转变为在 0.3 和 0.4 之间的磨擦系数发生了。 | Yuan GUO Xiong (Bill) YU | 2016 | Frontiers of Structural and Civil Engineering2016，10，1： | 2 |
| 3 | Preparation and biodistribution of ^125 I-IBZM:a potential CNS D2 dopamime receptor imaging agent显示文摘 | K ung H F Guo Y Z Billings J | 1988 | Int Rad Appl Instrum B1988，15，： | 1 |
| 4 | Understanding the microscopic moisture migration in pore space using DEM simulation显示文摘The deformation of soil skeleton and migration of pore fl uid are the major factors relevant to the triggering of and damages by liquefaction.The in fl uence of pore fl uid migration during earthquake has been demonstrated from recent model experiments and fi eld case studies.Most of the current liquefaction assessment models are based on testing of isotropic lique fi able materials.However the recent New Zealand earthquake shows much severer damages than those predicted by existing models.A fundamental cause has been contributed to the embedded layers of low permeability silts.The existence of these silt layers inhibits water migration under seismic loads,which accelerated liquefaction and caused a much larger settlement than that predicted by existing theories.This study intends to understand the process of moisture migration in the pore space of sand using discrete element method(DEM)simulation.Simulations were conducted on consolidated undrained triaxial testing of sand where a cylinder sample of sand was built and subjected to a constant con fi ning pressure and axial loading.The porosity distribution was monitored during the axial loading process.The spatial distribution of porosity change was determined,which had a direct relationship with the distribution of excess pore water pressure.The non-uniform distribution of excess pore water pressure causes moisture migration.From this,the migration of pore water during the loading process can be estimated.The results of DEM simulation show a few important observations:(1)External forces are mainly carried and transmitted by the particle chains of the soil sample;(2)Porosity distribution during loading is not uniform due to nonhomogeneous soil fabric(i.e.the initial particle arrangement and existence of particle chains);(3)Excess pore water pressure develops differently at different loading stages.At the early stage of loading,zones with a high initial porosity feature higher porosity changes under the in fl uence of external loading,which leads to a larger pore pressure variation(increase or decrease)in such zones.As the axial strain increases,particle rearrangement occurs and fi nal porosity distribution has minor relationship with the initial condition,and the pore pressure distribution becomes irregular.The differences in the pore pressure development imply that water will migrate in the pore space in order to balance the pore water pressure distribution.The results of this simulation offer an insight on the microscale water migration in the soil pore space,which is important for holistic description of the triggering of soil liquefaction in light of its microstructure. | Yuan Guo Xiong(Bill) Yu | 2015 | Journal of Rock Mechanics and Geotechnical Engineering2015，7，2： | 1 |
| 5 | A holistic computational model for prediction of clay suspension structure显示文摘The formation of clay suspensions involves complex interactions among clay particles subjected to the geochemical environment during the sedimentation process. The structural characteristics have a major influence on the physical and mechanical behavior of the suspension. A modeling framework involving a Discrete Element Method (DEM) model with customized particle mechanical interactions is proposed in this paper for the holistic prediction of the physical structure of clay suspensions. The particle interaction force model is based on the Derjaguin, Landau, Verwey, and Overbeek (DLVO) theory that accounts for electrostatic repulsion, van der Waals attraction, contact repulsion, etc. Kaolinite is used as the model clay to demonstrate the model performance. The surface charge density of kaolinite is obtained through Atomic Force Microscope (AFM) force measurement and is implemented in the particle interaction force model in the subsequent simulations. Influencing factors, such as centrifugal acceleration, ionic concentration, platy structure of particles, and particle size, on the formation of kaolinite suspensions are studied with the numerical model and compare favorably well with the experimental data. This work lays down a unique framework consisting of computational modeling and microscale characterization of clay particles to holistically predict the characteristics of clay suspensions, which paves the basis to model and predict their bulk physical and mechanical behavior. | Yuan Guo Xiong (Bill) Yu | 2019 | International Journal of Sediment Research2019，34，4： | 1 |
| 6 | Interlayer shear of nanomaterials:Graphene–graphene,boron nitride–boron nitride and graphene–boron nitride显示文摘In this paper, the interlayer sliding between graphene and boron nitride(h-BN) is studied by molecular dynamics simulations. The interlayer shear force between h-BN/h-BN is found to be six times higher than that of graphene/graphene, while the interlayer shear between graphene/h-BN is approximate to that of graphene/graphene. The graphene/hBN heterostructure shows several anomalous interlayer shear characteristics compared to its bilayer counterparts. For graphene/graphene and h-BN/h-BN, interlayer shears only exit along the sliding direction while interlayer shear for graphene/h-BN is observed along both the translocation and perpendicular directions. Our results provide significant insight into the interlayer shear characteristics of 2D nanomaterials. | Yinfeng Li Weiwei Zhang Bill Guo Dibakar Dattac | 2017 | Acta Mechanica Solida Sinica2017，30，3： | 1 |
您所在的机构暂未开通此部分的功能，请联系管理员